Fuchsite K(Al,Cr)2AlSi3O10(OH,F)2 - 9.EC.15 (Strunz)(from Brasil) Variety of green muscovite by hi
Fuchsite K(Al,Cr)2AlSi3O10(OH,F)2 - 9.EC.15 (Strunz)(from Brasil) Variety of green muscovite by high chromium content in the crystal structure, the aluminum is replaced by trivalent chromium. Muscovite is the most common mica, found in granites, pegmatites, gneisses, and schists, and as a contact metamorphic rock. It is anisotropic and has high birefringence. It has a highly-perfect basal cleavage yielding remarkably-thin laminæ (sheets) which are often highly elastic. -- source link
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